Countess Sophia Sergeyevna Ignatieva (Russian: Софья Серге́евна Игнатьева; born in St Petersburg as Princess Meshcherskaya (княжна Мещерская) 15 February 1851 — 18 February 1944 Paris, France) was Russian noblewoman, court lady and a socialite.

[1] She was married to Count Alexei Pavlovich Ignatiev (1842-1906), a General in the Imperial Russian Army and member of the noble Ignatyev family.

Sophia Sergeyevna owned eight houses in St Petersburg and was a landowner of Rzhev uyezd.

Playing an important role in clerical circles, she reportedly was an adherent of Bishop Hermogenes and priest Heliodorus, first friends later opponents of Grigori Rasputin.

[2] Countess Sophia Ignatieva introduced Rasputin to Milica of Montenegro and her sister Anastasia, who were interested in Persian mysticism,[3] spiritism, and occultism.